This is based on the Riverford Viaduct on the Launceston Branch which ran from Plymouth, Devon to Tavistock. Originally
built in the 1880s in broad gauge (7ft 1/4 in), this is as it appeard circa 1910 after the original wood and stone structure was replaced by
an arched viaduct. Made by request. Many thanks to Mike Brassington for the pics and info.